Typewriting machines – Sheet or web – For feeding sheet from stack or pack holder
Reexamination Certificate
2000-07-10
2001-03-27
Hilten, John S. (Department: 2854)
Typewriting machines
Sheet or web
For feeding sheet from stack or pack holder
C400S629000
Reexamination Certificate
active
06206591
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sheet carrying device for carrying sheet on a carrying belt in the state that the sheet is caused to adhere to the carrying belt by sucking power of a suction fan.
2. Description of the Related Art
In a stencil printing machine, which is an image forming machine, it is necessary to feed paper in a paper feed section to a printing section and discharge the paper on which images have been printed in the printing section to a paper discharge section. For such paper-discharge, for example, a paper carrying device in a suction manner is used.
FIG. 1
illustrates an outline of a paper carrying device of this type. As shown in
FIG. 1
, pulleys
1
and
2
are located between a paper carrying start position and a paper carrying end position. An endless carrying belt
3
is set up onto this pair of the pulleys
1
and
2
to stretch therebetween. One of the pulleys
1
and
2
is driven and rotated by a belt driving motor
4
. By the rotating power of the belt driving motor
4
, the carrying belt
3
is moved. A great number of non-illustrated air permeating holes are made in the carrying belt
3
. A suction fan
5
is positioned below the carrying belt
3
. This suction fan
5
is made so as to suck air above the fan
5
by driving power of a motor
5
a
for the fan.
In the above-mentioned structure, the carrying belt
3
is moved by driving power of the belt driving motor
4
, and the suction fan
5
is rotated by driving power of the motor
5
a
for the fan
5
. When the paper
6
on which images have been printed is loaded from the paper carrying start position onto the carrying belt
3
, the paper
6
is caused to adhere to the carrying belt
3
by sucking power of the suction fan
5
and the paper
6
in this adhesive state is carried to the paper carrying end position.
In the above-mentioned conventional paper carrying device, however, the sucking power of the suction fan
5
is constantly made a fixed value regardless of the size of the paper
6
, the basis weight thereof and the like. Therefore, in the case that the carried paper
6
is so firm and heavy as cardboard or is small and thin, more sucking power than is required is acted. As a result, there arise such problems that excessive electric power is consumed and excessive load is applied to the carrying belt
3
by excessive sucking power.
SUMMARY OF THE INVENTION
The present invention has been achieved in the light of the above-mentioned situation and an object of the present invention is to provide a sheet carrying device making it possible to act appropriate sucking power, depending on the sort of sheet to be carried.
A primary feature of the present invention is a sheet carrying device comprising a carrying belt which is disposed in a sheet discharge section of an image forming machine and can move by driving power, a suction fan located below the carrying belt, and a fan driving source which supplies rotating power to the suction fan, sheet on the carrying belt being caused to adhere to the carrying belt by sucking power of the suction fan and carried, further comprising a sheet data detecting unit for detecting data on the carried sheet, and a controlling unit for controlling driving power of the fan driving source to make the sheet sucking power appropriate on the basis of the data on the carried sheet detected by means of the sheet data detecting unit.
According to this feature, the controlling unit makes the driving power of the fan driving source variable, depending on characteristics of the sheet.
The sheet carrying device may comprise a surrounding atmosphere data detecting unit for detecting surrounding atmosphere data, whereby the controlling unit controls the driving power of the fan driving source under additional consideration of the surrounding atmosphere data detected by means of the surrounding atmosphere data detecting unit.
According to this feature, the controlling unit makes the driving power of the fan driving source variable under additional consideration of the surrounding atmosphere data.
The sheet carrying device may comprise a carrying condition detecting unit for detecting carrying conditions of the carrying belt, whereby the controlling unit controls the driving power of the fan driving source under additional consideration of the carrying conditions detected by means of the carrying condition detecting unit.
According to this feature, the controlling unit makes the driving power of the fan driving source variable under additional consideration of the carrying conditions of the carrying belt.
The sheet data detecting unit is preferably composed of a sheet size detecting unit and a basis weight detecting unit.
According to this feature, the characteristics of the sheet are judged from the size and the basis weight of the sheet. On the basis of these data, the controlling unit makes the driving power of the fan driving source variable.
The surrounding atmosphere detecting unit is preferably a temperature/moisture detecting unit.
According to this feature, the surrounding atmosphere is judged from temperature and moisture. Under additional consideration of these data, the controlling unit makes the driving power of the fan driving source variable.
The carrying condition detecting unit is preferably a unit for detecting the state of a wing which the device has.
According to this feature, the carrying conditions are judged from the wing state. Under additional consideration of the data, the controlling unit makes the driving power of the fan driving source variable.
Here, basis weight means the weight per a unit area of a sheet such as a paper.
Other and further objects and features of the present invention will become obvious upon understanding of the illustrative embodiments about to be described in connection with the accompanying drawings or will be indicated in the appended claims, and various advantages not referred to herein will occur to one skilled in the art upon employing of the invention in practice.
REFERENCES:
patent: 3827548 (1974-08-01), Matsuo
patent: 4589652 (1986-05-01), Silverberg
patent: 5967510 (1999-10-01), Ono et al.
Hilten John S.
Nath Gary M.
Nath & Associates PLLC
Nolan, Jr. Charles H.
Riso Kagaku Corporation
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